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Famous first tweets

President Barack Obama joined Twitter on May 18 and joked about joining Twitter six years after being elected POTUS.

Here's Obama's first tweet when he was still a U.S. senator gearing up for a White House run. Check out other famous first tweets on one of the world's largest social networks:

Garth Brooks created a new hashtag using his name in his first tweet on Nov. 11, 2014.

Britain's Queen Elizabeth II dipped a toe into 21st century communications on Oct. 24, 2014, when she posted her first tweet, signing herself Elizabeth R., for regina or queen.

Monica Lewinsky, the infamous paramour of former President Bill Clinton, joined Twitter on Oct. 20 under the handle @MonicaLewinsky, describing herself as a social activist, public speaker, contributor to Vanity Fair and "knitter of things without sleeves."

The CIA joined Twitter in June 2014 and proved it has a sense of humor with its first tweet.

Investor and philanthropist Warren Buffett sent his first tweet during an interview with Fortune. He said his first tweet has some meaning: "It means my family can no longer say I'm lodged back in the 19th century."

Former President Bill Clinton sent his first tweet with the help of comedian Stephen Colbert.

Prolific tweeter Ashton Kutcher became the first person to get 1 million followers on Twitter.

Oprah Winfrey launched her Twitter account the same day Twitter Chief Executive Evan Williams and famous tweeter Ashton Kutcher joined her on her show.

Singer Justin Bieber's first tweets directed fans to his other social media accounts. In this case, MySpace.

"Dear friends, I am pleased to get in touch with you through Twitter. Thank you for your generous response. I bless all of you from my heart."

Pope Benedict XVI started the Vatican’s Twitter account, @Pontifex, on Dec. 12, 2012. He resigned a few months later and deleted all of his tweets, but left the Twitter account open for his successor to use.

Pope Francis did decide to continue the Twitter account.

The pope got a lot of attention for joining Twitter, but he wasn't the first world-famous religious figure to send a tweet. The Dalai Lama started tweeting in February 2010.

Lady Gaga is known as a prolific tweeter. At one time, she was the most-followed person on the site.

This was not astronaut TJ Creamer's first tweet, but it was the first tweet sent from space.

Back when Twitter co-founder Jack Dorsey sent his first tweet, the site was called Twttr. No vowels allowed.

Comedian Conan O'Brien joined Twitter after being fired from his job as host at "The Tonight Show." As part of his severance agreement, he couldn't appear on television six months.

Actor Charlie Sheen joined Twitter while in the middle of a very public breakdown that included getting fired from his hit show "Two and a Half Men."

Jordan's Queen Rania is known for her advocacy work, and she's taken it to Twitter.

Actor Neil Patrick Harris is one of many actors to interject some comedy into his first tweet.

Philanthropist Bill Gates highlighted his work when he first joined Twitter.

Bill Cosby wanted to be sure followers knew just whose tweets were appearing on his account.